Carriage bolts feature a slightly rounded head and have no exposed sharp edges when fully fastened. Due to that reason, they are often used when a more aesthetic look is desired. They are commonly used on docks and on playground equipment or in cases where it may be difficult to reach the bolt head with a tool. The square shoulder on carriage bolts help to hold it in place while the nut is fastened.
- Size: 3/8 in.-16 x 4 in.
- Features a smooth rounded head as opposed to a standard hex head
- Square shoulder allows for nut to be tightened or loosened
- Often used in cases where a protruding bolt head could cause injury
- Nuts and washers not included, ensure washers and nuts are same diameter
- Thread type: coarse thread class: UNC-2A, point style, blunt
- Specification met, ASME B18.5 and ASTM A307A













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